Auto-create 10 contributor issues on merge with deduplication

[Copilot]

The workflow only fired on workflow_dispatch, so no issues had ever been created — the Issues tab was empty and contributors had nothing to find or claim.

Changes

.github/workflows/create-wave-issues.yml

• Added push: branches: [main] trigger (path-scoped) so all 10 issues are created automatically when this PR merges — no manual Action run required
• Consolidated into a single step with an ensureIssue() helper that fetches existing issue titles once and skips any that already exist, making the workflow fully idempotent

async function ensureIssue(title, labels, body) {
  if (existingIssues.includes(title)) {
    console.log(`SKIP (already exists): ${title}`);
    return;
  }
  await github.rest.issues.create({ owner, repo, title, labels, body });
}

• Standardized all 10 issue bodies: GitHub checkbox task lists (- [ ]), NatSpec documentation task present and consistently ordered (second-to-last, before deploy), and a /apply call-to-action so contributors know how to claim each issue

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